Furnace.



WILLIAM E. MILDNEB AND LEE WEBSTER, OF LOS ANGELES, CALIFORNIA.

' summon.

Specification of Letters Patent.

, To all whom it may concern."

Be it known that we, \VILLIAM E. MILD- NER and LEE \Vncsrnn, citizens ofthe United States, residing at Los Angeles, in the county of Los Angelesand State of California, have jointly invented a new and usefulImprovement in Furnaces, of which the following is a specification.

Our invention relates to the design and construction of a furnace inwhich we are able to secure perfect combustion of all the fuel andthrough perfect combustion we are able to entirely eliminate smoke andthe loss of fuel which smoke represents. These and other beneficialresults are attained by the means illustrated in the accompanyingdrawings, in which:

Figure 1, is a perspective of a furnace embodying our new and novelfeatures parts being broken away to show the interior of the device.Fig. 2, is an enlarged transverse section of a portion of the combustionchamber of said furnace.

In each of the views like characters indicate like parts and referringto the details of construction, 3 is the body of the furnace. This maybe masonry, metal lined with fire resisting material or any combinationof metal and masonry according to the special requirements of each case.The shape and design of the furnace are also to be modified to suitindividual requirements, the furnace shown in. the drawings being merelya conventional form serving best to illustrate our invention. 4:, is acombustion chamber of ordinary construction. 5 and 6 are air ductsextending longitudinally through the combustion chamber. The walls ofthese ducts are made of metal or other substance which will readilyserve as a conductor of heat. These fiues have inlets through theexterior walls of the furnace. When the furnace is in operation theseducts, subjected to the high temperature of the combustion chamber andthe close proximity of the fire, become very hot and air passing throughthese ducts from the exterior of the furnace to the distributing pipe 7absorbs the heat radiated from the walls of the ducts and passes outthrough the slot 9 in the pipe 7 at a very high temperature. 10 is adamper for regulatlng the flow of superheated air passing through theducts 5 and 6 by by-passing all or a portion through the pipe 11. 8indicates the grate supporting the fuel during combustion. 12

'in the doors are closed and the air is a handle by means of which thedamper 10 is moved. This handle projects through the wall of thefurnace.

The operation of the furnace is briefly dcscribed as follows: The fuelis placed on the grate and ignited after the usual manner. Air necessaryto start vigorous combustion is admitted through vents in the doors ofthe furnace. The damper 10 is used to close the pipe 11 in the airducts. WVhen sufiicient time has elapsed to heat up the furnace andparticularly the air ducts 5 and 6, the vents necessary to supply oxygento maintain combustion is supplied from the pipe 7. This air, as beforestated, has been superheated in passing through the ducts 5 and 6 and inthis condition greatly facilitates the ignition of the gases escapingfrom the fuel and also the floating particles of carbon which in thepresence of a draft of cold air, would chill and pass out as smoke,instead of igniting and adding their value to the other heat unitsproduced. In order to secure most satisfactory results and highestefficiency it is found desirable to regulate the amount of superheatedair passing over the fuel on the grate.

By opening the damper 10 any desired portion of the air from the ducts 5and 6 is permitted to escape directly into the combustionchamber back ofthe fire, igniting the escaping gases, thence carbon-oxid passing intothe flue and the atmosphere outside the furnace.

The suction produced by the burned gases escaping from the chimneyfurnishes the draft which draws in the air through the ducts 5 and 6 andpipe 7. The course taken by the air is shown by small arrows in thefigures in the drawings.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is:

In a furnace having a fire box and grate, the combination with acombustion chamber, of air ducts extending longitudinally of saidchamber at the sides thereof and having the rear ends thereof open tothe atmosphere through the rear wall of the furnace, and the other endsextending downwardly across the ends of the fire box and over the endsof the grate and terminating at the outer edge of the grate, and adistributing pipe extending across said outer edge of the grate andhaving the ends thereof in Patented May as, 1L9l8. 1

communication With the ducts, said pipe being provided with alongitudinal slot for discharging ali rover the fuel on the grate,-

a pipe connected. with each of said ducts at the downwardly deflectedportion thereof and adjacent to the horizontal portion, and on the"side-bf t the grate-opposite to *thedi'stributing pipe, for dischargingairinto the combustion chamber behind the burning fuel, and dampers,pivotally mounted at the point here the pipes discharging behind thegrate communicate withthedownwardly extending portions of the ducts,said. dampers when closed providing substan- "'tia 1ly continuous Wallmembers for the ducts first named, and When in open position deflectinga portion of the incoming air to the pipes discharging air behind thegrate.

WVILLIAM E. MILDNER. I LEE \VEBSTER.

Witnesses:

'JE NIE B. PARKER,

PHIL .RAGINE.

Copies of this patent may be obtained for fivecentsieaeh, by addressing"the Commissioner of Patents,

Washington, D. G.

